Houstonia sharpii, the Hidalgo bluet, is a plant species in the family Rubiaceae. It is a herbaceous perennial up to 30 cm tall, spreading by means of stolons spreading along the surface of the ground. It also has white flowers.Nesom, Guy L. 1988. Systematic Botany 13(3): 434, Hedyotis sharpii It is native to the states of Hidalgo, Puebla and Veracruz in Mexico.Kew World Checklist of Selected Plant FamiliesCONABIO. 2009. Catálogo taxonómico de especies de México. 1. In Capital Nat. México. CONABIO, Mexico City.Instituto de Biología. "Houstonia sharpii Torrell - IBUNAM:MEXU:PV1156910". UNIBIO: Colecciones Biológicas. 2010-05-27. Universidad Nacional Autónoma de México. Consultada en: 2014-5-6. Disponible en: <http://unibio.unam.mx/collections/specimens/urn/IBUNAM:MEXU:PV1156910 >
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